package com.jiandp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.jiandp.dto.LoginFormDTO;
import com.jiandp.dto.Result;
import com.jiandp.dto.UserDTO;
import com.jiandp.entity.User;
import com.jiandp.mapper.UserMapper;
import com.jiandp.service.IUserService;
import com.jiandp.utils.RegexUtils;
import com.jiandp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.jiandp.utils.RedisConstants.*;
import static com.jiandp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            //2.不符合返回错误
            return Result.fail("手机号格式错误");
        }
        //3.符合生成验证码
        String code = RandomUtil.randomNumbers(6);

        //4.保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);


        //5.发送验证码
        log.debug("发送验证码成功，验证码:{}",code);
        //返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        String phone = loginForm.getPhone();
        //1.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            //2.不符合返回错误
            return Result.fail("手机号格式错误");
        }
        //2. 校验验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+phone);
        String code = loginForm.getCode();
        if (cacheCode==null||!cacheCode.equals(code)){
            //3.不一致，报错
            return Result.fail("验证码错误");
        }
        //4.一致，根据手机号查询用户 select * from tb_user  where phone=?
        User user= query().eq("phone", phone).one();
        //5.判断用户是否存在
        if (user==null){
            //6.不存在创建新用户并保存
           user =  createUserWithPhone(phone);
        }

        //7.保存用户信息到redis中
        //  7.1随机生成一份token,作为登录令牌
        String token = UUID.randomUUID().toString().replace("-", "");
        //  7.2将user对象转为Hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        //  7.3保存
       String tokenKey= LOGIN_USER_KEY+ token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        //设置token的有效期
        stringRedisTemplate.expire(tokenKey, LOGIN_USER_TTL,TimeUnit.MINUTES);

        return Result.ok(token);
    }

    @Override
    public Result sign() {
        //获取当前用户
        Long userId = UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now = LocalDateTime.now();
        //拼接key
        String keySuffix= now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY+userId+keySuffix;
        //获取今天是本月得第几天
        int dayOfMonth = now.getDayOfMonth();
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        // 1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
// 2.获取日期
        LocalDateTime now = LocalDateTime.now();
// 3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern("yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
// 4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
// 5.获取本月截止今天为止的所有的签到记录，返回的是一个十进制的数字 BITFIELD sign:5:202203 GET u14 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result == null || result.isEmpty()) {
            // 没有任何签到结果
            return Result.ok(0);
        }

        Long num = result.get(0);
        if (num == null || num == 0) {
            return Result.ok(0);
        }
// 6.循环遍历
        int count = 0;
        while (true) {
            // 6.1.让这个数字与1做与运算，得到数字的最后一个bit位  // 判断这个bit位是否为0
            if ((num & 1) == 0) {
                // 如果为0，说明未签到，结束
                break;
            } else {
                // 如果不为0，说明已签到，计数器+1
                count++;
            }
            // 把数字右移一位，抛弃最后一个bit位，继续下一个bit位
            num >>>= 1;
        }
        return Result.ok(count);


    }

    private User createUserWithPhone(String phone) {
        //1.创建用户
        User user=new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;
    }
}
